Business process automation provides advanced capabilities for optimization and enhancement of your existing business, manufacture or any production establishment. In particular, when it comes to the print on demand business, a dedicated print on demand API will help you interconnect underlying workflow processes, combine separate apps and digital capacities, and accelerate eCommerce workflow as a whole.

An API interface integrated with, for example, a marketplace platform like Etsy, offers a wide range of tools and capacities to efficiently manage both an online store and certain internal production processes.
https://multi-programming.com/blog/how-to-automate-a-print-on-demand-store-via-api-2